18276981 has 12 divisors (see below), whose sum is σ = 24644256. Its totient is φ = 12048280.

The previous prime is 18276977. The next prime is 18277037. The reversal of 18276981 is 18967281.

It is not a de Polignac number, because 18276981 - 2² = 18276977 is a prime.

It is a super-2 number, since 2×18276981² = 668096068948722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18276901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95596 + ... + 95786.

It is an arithmetic number, because the mean of its divisors is an integer number (2053688).

Almost surely, 2^18276981 is an apocalyptic number.

It is an amenable number.

18276981 is a deficient number, since it is larger than the sum of its proper divisors (6367275).

18276981 is an equidigital number, since it uses as much as digits as its factorization.

18276981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 361 counting only the distinct ones).

The product of its digits is 48384, while the sum is 42.

The square root of 18276981 is about 4275.1585935495. The cubic root of 18276981 is about 263.4115537896.

The spelling of 18276981 in words is "eighteen million, two hundred seventy-six thousand, nine hundred eighty-one".